0
マップのアクティビティが遅すぎるため、マップのアクティビティがより速くなりたいです。どうすればこれを達成できますか？地図のプリロードは効果的だと聞きましたが、これをどうやって行うのか分かりません。私は少し混乱しているので私の全体の地図活動を掲示するつもりはないですが、私はマップをロードするために同じ方法を使用したベースサンプル（Githubから）を投稿します。Android Appでマップアクティビティをより速くロードする
import android.app.ProgressDialog;
import android.graphics.Color;
import android.location.Location;
import android.net.Uri;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import com.google.android.gms.appindexing.Action;
import com.google.android.gms.appindexing.AppIndex;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.gms.maps.model.Polyline;
import com.google.android.gms.maps.model.PolylineOptions;
import com.google.maps.android.SphericalUtil;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.List;
public class MapsActivity extends FragmentActivity implements
OnMapReadyCallback,
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
GoogleMap.OnMarkerDragListener,
GoogleMap.OnMapLongClickListener,
View.OnClickListener{
//Our Map
private GoogleMap mMap;
//To store longitude and latitude from map
private double longitude;
private double latitude;
//From -> the first coordinate from where we need to calculate the distance
private double fromLongitude;
private double fromLatitude;
//To -> the second coordinate to where we need to calculate the distance
private double toLongitude;
private double toLatitude;
//Google ApiClient
private GoogleApiClient googleApiClient;
//Our buttons
private Button buttonSetTo;
private Button buttonSetFrom;
private Button buttonCalcDistance;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
//Initializing googleapi client
// ATTENTION: This "addApi(AppIndex.API)"was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
googleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.addApi(AppIndex.API).build();
buttonSetTo = (Button) findViewById(R.id.buttonSetTo);
buttonSetFrom = (Button) findViewById(R.id.buttonSetFrom);
buttonCalcDistance = (Button) findViewById(R.id.buttonCalcDistance);
buttonSetTo.setOnClickListener(this);
buttonSetFrom.setOnClickListener(this);
buttonCalcDistance.setOnClickListener(this);
}
@Override
protected void onStart() {
googleApiClient.connect();
super.onStart();
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
Action viewAction = Action.newAction(
Action.TYPE_VIEW, // TODO: choose an action type.
"Maps Page", // TODO: Define a title for the content shown.
// TODO: If you have web page content that matches this app activity's content,
// make sure this auto-generated web page URL is correct.
// Otherwise, set the URL to null.
Uri.parse("http://host/path"),
// TODO: Make sure this auto-generated app deep link URI is correct.
Uri.parse("android-app://net.simplifiedcoding.googlemapsdistancecalc/http/host/path")
);
AppIndex.AppIndexApi.start(googleApiClient, viewAction);
}
@Override
protected void onStop() {
googleApiClient.disconnect();
super.onStop();
// ATTENTION: This was auto-generated to implement the App Indexing API.
// See https://g.co/AppIndexing/AndroidStudio for more information.
Action viewAction = Action.newAction(
Action.TYPE_VIEW, // TODO: choose an action type.
"Maps Page", // TODO: Define a title for the content shown.
// TODO: If you have web page content that matches this app activity's content,
// make sure this auto-generated web page URL is correct.
// Otherwise, set the URL to null.
Uri.parse("http://host/path"),
// TODO: Make sure this auto-generated app deep link URI is correct.
Uri.parse("android-app://net.simplifiedcoding.googlemapsdistancecalc/http/host/path")
);
AppIndex.AppIndexApi.end(googleApiClient, viewAction);
}
//Getting current location
private void getCurrentLocation() {
mMap.clear();
//Creating a location object
Location location = LocationServices.FusedLocationApi.getLastLocation(googleApiClient);
if (location != null) {
//Getting longitude and latitude
longitude = location.getLongitude();
latitude = location.getLatitude();
//moving the map to location
moveMap();
}
}
//Function to move the map
private void moveMap() {
//Creating a LatLng Object to store Coordinates
LatLng latLng = new LatLng(latitude, longitude);
//Adding marker to map
mMap.addMarker(new MarkerOptions()
.position(latLng) //setting position
.draggable(true) //Making the marker draggable
.title("Current Location")); //Adding a title
//Moving the camera
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
//Animating the camera
mMap.animateCamera(CameraUpdateFactory.zoomTo(15));
}
public String makeURL (double sourcelat, double sourcelog, double destlat, double destlog){
StringBuilder urlString = new StringBuilder();
urlString.append("https://maps.googleapis.com/maps/api/directions/json");
urlString.append("?origin=");// from
urlString.append(Double.toString(sourcelat));
urlString.append(",");
urlString
.append(Double.toString(sourcelog));
urlString.append("&destination=");// to
urlString
.append(Double.toString(destlat));
urlString.append(",");
urlString.append(Double.toString(destlog));
urlString.append("&sensor=false&mode=driving&alternatives=true");
urlString.append("&key=AIzaSyCJVpM7-ayGMraxFRzq4U8Dt1uRNsmiaws");
return urlString.toString();
}
private void getDirection(){
//Getting the URL
String url = makeURL(fromLatitude, fromLongitude, toLatitude, toLongitude);
//Showing a dialog till we get the route
final ProgressDialog loading = ProgressDialog.show(this, "Getting Route", "Please wait...", false, false);
//Creating a string request
StringRequest stringRequest = new StringRequest(url,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
loading.dismiss();
//Calling the method drawPath to draw the path
drawPath(response);
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
loading.dismiss();
}
});
//Adding the request to request queue
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
//The parameter is the server response
public void drawPath(String result) {
//Getting both the coordinates
LatLng from = new LatLng(fromLatitude,fromLongitude);
LatLng to = new LatLng(toLatitude,toLongitude);
//Calculating the distance in meters
Double distance = SphericalUtil.computeDistanceBetween(from, to);
//Displaying the distance
Toast.makeText(this,String.valueOf(distance+" Meters"),Toast.LENGTH_SHORT).show();
try {
//Parsing json
final JSONObject json = new JSONObject(result);
JSONArray routeArray = json.getJSONArray("routes");
JSONObject routes = routeArray.getJSONObject(0);
JSONObject overviewPolylines = routes.getJSONObject("overview_polyline");
String encodedString = overviewPolylines.getString("points");
List<LatLng> list = decodePoly(encodedString);
Polyline line = mMap.addPolyline(new PolylineOptions()
.addAll(list)
.width(20)
.color(Color.RED)
.geodesic(true)
);
}
catch (JSONException e) {
}
}
private List<LatLng> decodePoly(String encoded) {
List<LatLng> poly = new ArrayList<LatLng>();
int index = 0, len = encoded.length();
int lat = 0, lng = 0;
while (index < len) {
int b, shift = 0, result = 0;
do {
b = encoded.charAt(index++) - 63;
result |= (b & 0x1f) << shift;
shift += 5;
} while (b >= 0x20);
int dlat = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
lat += dlat;
shift = 0;
result = 0;
do {
b = encoded.charAt(index++) - 63;
result |= (b & 0x1f) << shift;
shift += 5;
} while (b >= 0x20);
int dlng = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
lng += dlng;
LatLng p = new LatLng((((double) lat/1E5)),
(((double) lng/1E5)));
poly.add(p);
}
return poly;
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
LatLng latLng = new LatLng(-34, 151);
mMap.addMarker(new MarkerOptions().position(latLng).draggable(true));
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
mMap.setOnMarkerDragListener(this);
mMap.setOnMapLongClickListener(this);
}
@Override
public void onConnected(Bundle bundle) {
getCurrentLocation();
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
}
@Override
public void onMapLongClick(LatLng latLng) {
//Clearing all the markers
mMap.clear();
//Adding a new marker to the current pressed position
mMap.addMarker(new MarkerOptions()
.position(latLng)
.draggable(true));
latitude = latLng.latitude;
longitude = latLng.longitude;
}
@Override
public void onMarkerDragStart(Marker marker) {
}
@Override
public void onMarkerDrag(Marker marker) {
}
@Override
public void onMarkerDragEnd(Marker marker) {
//Getting the coordinates
latitude = marker.getPosition().latitude;
longitude = marker.getPosition().longitude;
//Moving the map
moveMap();
}
@Override
public void onClick(View v) {
if(v == buttonSetFrom){
fromLatitude = latitude;
fromLongitude = longitude;
Toast.makeText(this,"From set",Toast.LENGTH_SHORT).show();
}
if(v == buttonSetTo){
toLatitude = latitude;
toLongitude = longitude;
Toast.makeText(this,"To set",Toast.LENGTH_SHORT).show();
}
if(v == buttonCalcDistance){
getDirection();
}
}
}
ありがとうございます。
変更マップのプロバイダーをご利用ですか？ – Vince